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Prepayments and other receivables (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Prepayments and other receivables        
Deposit receivable ¥ 127,732 ¥ 625,371    
Value-added-tax deductible 152,930 188,501    
Advance to suppliers 29,055 49,492    
Advance to staff 10,680 13,238    
Others 35,090 41,471    
Less: impairment loss allowance (6,760) (5,719) ¥ (7,276) ¥ (2,968)
Total 348,727 912,354    
Less: Non-current portion of other receivables (6,506) (6,663)    
Total ¥ 342,221 ¥ 905,691